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Loans and Allowance for Loan Losses (Details 8) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable $ 1,068,432 $ 974,029
Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 71,786 73,261
Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 4,121 4,047
Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 4,684 5,715
Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 5,672 3,429
Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 86,263 86,452
Commercial, financial, and agricultural    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 192,238 182,881
Commercial, financial, and agricultural | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 9,868 10,295
Commercial, financial, and agricultural | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 658 798
Commercial, financial, and agricultural | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 500 635
Commercial, financial, and agricultural | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,507 982
Commercial, financial, and agricultural | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 13,533 12,710
Residential real estate | Construction    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 26,492 18,907
Residential real estate | Construction | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,459 665
Residential real estate | Construction | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 462 640
Residential real estate | Construction | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Residential real estate | Construction | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Residential real estate | Construction | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,921 1,305
Residential real estate | Mortgages    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 246,754 259,900
Residential real estate | Mortgages | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 9,978 16,577
Residential real estate | Mortgages | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,262 2,159
Residential real estate | Mortgages | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 3,116 3,582
Residential real estate | Mortgages | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,956 1,888
Residential real estate | Mortgages | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 17,312 24,206
Commercial real estate | Construction    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 98,340 55,653
Commercial real estate | Construction | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,284 1,113
Commercial real estate | Construction | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Commercial real estate | Construction | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Commercial real estate | Construction | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 97 50
Commercial real estate | Construction | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,381 1,163
Commercial real estate | Mortgages    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 472,455 426,470
Commercial real estate | Mortgages | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 49,197 44,611
Commercial real estate | Mortgages | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 723 426
Commercial real estate | Mortgages | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,068 1,498
Commercial real estate | Mortgages | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 936 420
Commercial real estate | Mortgages | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 51,924 46,955
Installment and other consumer    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 32,153 30,218
Installment and other consumer | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Installment and other consumer | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 16 24
Installment and other consumer | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Installment and other consumer | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 176 89
Installment and other consumer | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable $ 192 $ 113